A woman in her thirties whose name is Ruki lives alone in Tokyo and works from home processing medical insurance claims. She finishes a month's worth of work in a single week and devotes the rest of her time entirely to her own pleasures: borrowing stacks of books from the library, pursuing a quiet passion for stamp collecting, and riding her bicycle around the neighborhood. She is profoundly unconcerned with fashion, trends, or what others think of her. Her best friend is Ecchan, an office lady who works at a conventional company and is deeply invested in trendy restaurants, fashionable clothes, and the small anxieties of corporate life. Despite their opposite temperaments, the two women share an easy, affectionate friendship, visiting each other's homes, running errands together, and celebrating birthdays by gifting each other with household chores. The episodic strips track their daily routines through the late 1980s and early 1990s, a period when Japan's bubble economy was at its peak and then began to deflate. Ecchan initially spends freely on clothes and dining out, but later strips show her growing cautious about money as economic conditions worsen. Ruki, by contrast, remains steadfastly indifferent to the boom and bust; even when Ecchan remarks that the economy seems to be in bad shape, Ruki cheerfully declares she would rather sell everything she owns than work any harder. Her wardrobe changes so rarely that Ecchan complains time seems to have no effect on her. A recurring thread involves a friendly young man who works at a bicycle shop. After repairing Ruki's flat tire, he encounters her several times around town, first mistaking her for a married woman and then for a mother because he sees her playing with a child at the library. He never corrects her, and Ruki does not bother to set the record straight. When he later realizes she is single and tries to flirt, she simply ignores him. The story concludes with Ruki moving to Naples, sending Ecchan a postcard from abroad that describes her new life with characteristic nonchalance, leaving even her closest friend unsure whether to believe it. The manga ultimately offers a gently humorous, affectionate portrait of two women navigating ordinary life against the backdrop of a rapidly changing society, with Ruki embodying a quiet, unshakeable freedom that neither economic booms nor busts can disturb.